We’re working with our suppliers for the flash storage and module integration on the 1TB Expansion Card on this. We have found that there is a small amount of unit-to-unit variation along with variability in performance from ambient temperature, but the biggest impact on throttling is the length of sustained sequential write. Sustained read and mixed or random read/write will generally not result in throttling, but sustained write will.
The good news is that we have found that applying a thermal pad from the flash package to the aluminum housing of the card substantially lengthens the write time before throttling. We’re working with our suppliers to qualify a new thermal pad and introduce this into new production soon, and we’ll also send out thermal pads and instructions on how to install them to anyone with a current 1TB Expansion Card who is interested in it once we have thermal pads available. For anyone who wants to experiment in the meantime, something like this is roughly what we’ll be using: https://www.digikey.com/en/products/detail/t-global-technology/TG-A1250-10-10-1-5/11617050